Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1997-08-26
2000-04-18
Jackson, Stephen W.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307130, 361 2, 361 79, H01H 4700
Patent
active
060518944
ABSTRACT:
The safety device of industrial robot of the invention is intended to assure safety of the operator for teaching operation of an industrial robot.
In the safety device of the industrial robot of the invention, a switch having two contacts working simultaneously is used as the dead-man's switch provided in the teaching pendant, and by monitoring the open or closed state of the two contacts working simultaneously, fusion of contact is judged by miss-matching of the opening and closing action, and the operation of the robot is stopped immediately. Besides, as an over-travel switch for actuating when the robot main body gets out of the normal moving range, a switch having two contacts working simultaneously is used, and by monitoring the open or closed state of the two contacts working simultaneously, fusion of contact is judged by miss-matching-of the opening and closing state, and the operation of the robot is stopped immediately.
Moreover, in the safety device of the industrial robot of the invention, it is constituted to detect individually the energized state of the coils of the relays for composing the safety circuit responsible for emergency stop, and the open and closed state of these relay contacts, and fusion of contact is judged by miss-matching of the coil energized state and the open and closed state of the contacts, so that the operation of the robot is stopped immediately.
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Jackson Stephen W.
Matsushita Electric - Industrial Co., Ltd.
Zura Peter
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